//
// decl.cs: Declaration base class for structs, classes, enums and interfaces.
//
// Author: Miguel de Icaza (miguel@gnu.org)
// Marek Safar (marek.safar@seznam.cz)
//
// Licensed under the terms of the GNU GPL
//
// (C) 2001 Ximian, Inc (http://www.ximian.com)
//
// TODO: Move the method verification stuff from the class.cs and interface.cs here
//
using System;
using System.Collections;
using System.Globalization;
using System.Reflection.Emit;
using System.Reflection;
namespace Mono.CSharp {
///
/// Base representation for members. This is used to keep track
/// of Name, Location and Modifier flags, and handling Attributes.
///
public abstract class MemberCore : Attributable {
///
/// Public name
///
public string Name;
///
/// Modifier flags that the user specified in the source code
///
public int ModFlags;
///
/// Location where this declaration happens
///
public readonly Location Location;
[Flags]
public enum Flags {
Obsolete_Undetected = 1, // Obsolete attribute has not been detected yet
Obsolete = 1 << 1, // Type has obsolete attribute
ClsCompliance_Undetected = 1 << 2, // CLS Compliance has not been detected yet
ClsCompliant = 1 << 3, // Type is CLS Compliant
CloseTypeCreated = 1 << 4, // Tracks whether we have Closed the type
HasCompliantAttribute_Undetected = 1 << 5, // Presence of CLSCompliantAttribute has not been detected
HasClsCompliantAttribute = 1 << 6, // Type has CLSCompliantAttribute
ClsCompliantAttributeTrue = 1 << 7, // Type has CLSCompliant (true)
Excluded_Undetected = 1 << 8, // Conditional attribute has not been detected yet
Excluded = 1 << 9 // Method is conditional
}
///
/// MemberCore flags at first detected then cached
///
protected Flags caching_flags;
public MemberCore (string name, Attributes attrs, Location loc)
: base (attrs)
{
Name = name;
Location = loc;
caching_flags = Flags.Obsolete_Undetected | Flags.ClsCompliance_Undetected | Flags.HasCompliantAttribute_Undetected | Flags.Excluded_Undetected;
}
///
/// Tests presence of ObsoleteAttribute and report proper error
///
protected void CheckUsageOfObsoleteAttribute (Type type)
{
if (type == null)
return;
ObsoleteAttribute obsolete_attr = AttributeTester.GetObsoleteAttribute (type);
if (obsolete_attr == null)
return;
AttributeTester.Report_ObsoleteMessage (obsolete_attr, type.FullName, Location);
}
public abstract bool Define (TypeContainer parent);
//
// Returns full member name for error message
//
public virtual string GetSignatureForError ()
{
return Name;
}
///
/// Base Emit method. This is also entry point for CLS-Compliant verification.
///
public virtual void Emit (TypeContainer container)
{
VerifyObsoleteAttribute ();
if (!RootContext.VerifyClsCompliance)
return;
VerifyClsCompliance (container);
}
//
// Whehter is it ok to use an unsafe pointer in this type container
//
public bool UnsafeOK (DeclSpace parent)
{
//
// First check if this MemberCore modifier flags has unsafe set
//
if ((ModFlags & Modifiers.UNSAFE) != 0)
return true;
if (parent.UnsafeContext)
return true;
Expression.UnsafeError (Location);
return false;
}
///
/// Returns instance of ObsoleteAttribute for this MemberCore
///
public ObsoleteAttribute GetObsoleteAttribute (DeclSpace ds)
{
// ((flags & (Flags.Obsolete_Undetected | Flags.Obsolete)) == 0) is slower, but why ?
if ((caching_flags & Flags.Obsolete_Undetected) == 0 && (caching_flags & Flags.Obsolete) == 0) {
return null;
}
caching_flags &= ~Flags.Obsolete_Undetected;
if (OptAttributes == null)
return null;
// TODO: remove this allocation
EmitContext ec = new EmitContext (ds.Parent, ds, ds.Location,
null, null, ds.ModFlags, false);
Attribute obsolete_attr = OptAttributes.Search (TypeManager.obsolete_attribute_type, ec);
if (obsolete_attr == null)
return null;
ObsoleteAttribute obsolete = obsolete_attr.GetObsoleteAttribute (ds);
if (obsolete == null)
return null;
caching_flags |= Flags.Obsolete;
return obsolete;
}
///
/// Analyze whether CLS-Compliant verification must be execute for this MemberCore.
///
public override bool IsClsCompliaceRequired (DeclSpace container)
{
if ((caching_flags & Flags.ClsCompliance_Undetected) == 0)
return (caching_flags & Flags.ClsCompliant) != 0;
if (GetClsCompliantAttributeValue (container) && IsExposedFromAssembly (container)) {
caching_flags &= ~Flags.ClsCompliance_Undetected;
caching_flags |= Flags.ClsCompliant;
return true;
}
caching_flags &= ~Flags.ClsCompliance_Undetected;
return false;
}
///
/// Returns true when MemberCore is exposed from assembly.
///
protected bool IsExposedFromAssembly (DeclSpace ds)
{
if ((ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
return false;
DeclSpace parentContainer = ds;
while (parentContainer != null && parentContainer.ModFlags != 0) {
if ((parentContainer.ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
return false;
parentContainer = parentContainer.Parent;
}
return true;
}
///
/// Resolve CLSCompliantAttribute value or gets cached value.
///
bool GetClsCompliantAttributeValue (DeclSpace ds)
{
if (OptAttributes != null) {
EmitContext ec = new EmitContext (ds.Parent, ds, ds.Location,
null, null, ds.ModFlags, false);
Attribute cls_attribute = OptAttributes.GetClsCompliantAttribute (ec);
if (cls_attribute != null) {
caching_flags |= Flags.HasClsCompliantAttribute;
return cls_attribute.GetClsCompliantAttributeValue (ds);
}
}
return ds.GetClsCompliantAttributeValue ();
}
///
/// Returns true if MemberCore is explicitly marked with CLSCompliantAttribute
///
protected bool HasClsCompliantAttribute {
get {
return (caching_flags & Flags.HasClsCompliantAttribute) != 0;
}
}
///
/// This method is used to testing error 3005 (Method or parameter name collision).
///
protected abstract bool IsIdentifierClsCompliant (DeclSpace ds);
///
/// Common helper method for identifier and parameters CLS-Compliant testing.
/// When return false error 3005 is reported. True means no violation.
/// And error 3006 tests are peformed here because of speed.
///
protected bool IsIdentifierAndParamClsCompliant (DeclSpace ds, string name, MemberInfo methodBuilder, Type[] paramTypes)
{
MemberList ml = ds.FindMembers (MemberTypes.Event | MemberTypes.Field | MemberTypes.Method | MemberTypes.Property,
BindingFlags.Public | BindingFlags.Static | BindingFlags.Instance, System.Type.FilterNameIgnoreCase, name);
if (ml.Count < 2)
return true;
bool error3006 = false;
for (int i = 0; i < ml.Count; ++i) {
MemberInfo mi = ml [i];
if (name == mi.Name) {
MethodBase method = mi as MethodBase;
if (method == null || method == methodBuilder || paramTypes == null || paramTypes.Length == 0)
continue;
if (AttributeTester.AreOverloadedMethodParamsClsCompliant (paramTypes, TypeManager.GetArgumentTypes (method))) {
error3006 = false;
continue;
}
error3006 = true;
}
// We need to test if member is not marked as CLSCompliant (false) and if type is not only internal
// because BindingFlags.Public returns internal types too
DeclSpace temp_ds = TypeManager.LookupDeclSpace (mi.DeclaringType);
// Type is external, we can get attribute directly
if (temp_ds == null) {
object[] cls_attribute = mi.GetCustomAttributes (TypeManager.cls_compliant_attribute_type, false);
if (cls_attribute.Length == 1 && (!((CLSCompliantAttribute)cls_attribute[0]).IsCompliant))
continue;
} else {
string tmp_name = String.Concat (temp_ds.Name, '.', mi.Name);
MemberCore mc = temp_ds.GetDefinition (tmp_name) as MemberCore;
if (!mc.IsClsCompliaceRequired (ds))
continue;
}
for (int ii = 0; ii < ml.Count; ++ii) {
mi = ml [ii];
if (name == mi.Name)
continue;
Report.SymbolRelatedToPreviousError (mi);
}
if (error3006)
Report.Error_T (3006, Location, GetSignatureForError ());
return error3006;
}
return true;
}
///
/// The main virtual method for CLS-Compliant verifications.
/// The method returns true if member is CLS-Compliant and false if member is not
/// CLS-Compliant which means that CLS-Compliant tests are not necessary. A descendants override it
/// and add their extra verifications.
///
protected virtual bool VerifyClsCompliance (DeclSpace ds)
{
if (!IsClsCompliaceRequired (ds)) {
if (HasClsCompliantAttribute && !IsExposedFromAssembly (ds)) {
Report.Warning_T (3019, Location, GetSignatureForError ());
}
return false;
}
if (!CodeGen.Assembly.IsClsCompliant) {
if (HasClsCompliantAttribute) {
Report.Error_T (3014, Location, GetSignatureForError ());
}
}
int index = Name.LastIndexOf ('.');
if (Name [index > 0 ? index + 1 : 0] == '_') {
Report.Error_T (3008, Location, GetSignatureForError () );
}
if (!IsIdentifierClsCompliant (ds)) {
Report.Error_T (3005, Location, GetSignatureForError ());
}
return true;
}
protected abstract void VerifyObsoleteAttribute ();
}
///
/// Base class for structs, classes, enumerations and interfaces.
///
///
/// They all create new declaration spaces. This
/// provides the common foundation for managing those name
/// spaces.
///
public abstract class DeclSpace : MemberCore {
///
/// this points to the actual definition that is being
/// created with System.Reflection.Emit
///
public TypeBuilder TypeBuilder;
//
// This is the namespace in which this typecontainer
// was declared. We use this to resolve names.
//
public NamespaceEntry NamespaceEntry;
public Hashtable Cache = new Hashtable ();
public string Basename;
///
/// defined_names is used for toplevel objects
///
protected Hashtable defined_names;
TypeContainer parent;
static string[] attribute_targets = new string [] { "type" };
public DeclSpace (NamespaceEntry ns, TypeContainer parent, string name, Attributes attrs, Location l)
: base (name, attrs, l)
{
NamespaceEntry = ns;
Basename = name.Substring (1 + name.LastIndexOf ('.'));
defined_names = new Hashtable ();
this.parent = parent;
}
public void RecordDecl ()
{
if ((NamespaceEntry != null) && (parent == RootContext.Tree.Types))
NamespaceEntry.DefineName (Basename, this);
}
///
/// The result value from adding an declaration into
/// a struct or a class
///
public enum AdditionResult {
///
/// The declaration has been successfully
/// added to the declation space.
///
Success,
///
/// The symbol has already been defined.
///
NameExists,
///
/// Returned if the declation being added to the
/// name space clashes with its container name.
///
/// The only exceptions for this are constructors
/// and static constructors
///
EnclosingClash,
///
/// Returned if a constructor was created (because syntactically
/// it looked like a constructor) but was not (because the name
/// of the method is not the same as the container class
///
NotAConstructor,
///
/// This is only used by static constructors to emit the
/// error 111, but this error for other things really
/// happens at another level for other functions.
///
MethodExists,
///
/// Some other error.
///
Error
}
///
/// Returns a status code based purely on the name
/// of the member being added
///
protected AdditionResult IsValid (string basename, string name)
{
if (basename == Basename)
return AdditionResult.EnclosingClash;
if (defined_names.Contains (name))
return AdditionResult.NameExists;
return AdditionResult.Success;
}
public static int length;
public static int small;
///
/// Introduce @name into this declaration space and
/// associates it with the object @o. Note that for
/// methods this will just point to the first method. o
///
public void DefineName (string name, object o)
{
defined_names.Add (name, o);
#if DEBUGME
int p = name.LastIndexOf ('.');
int l = name.Length;
length += l;
small += l -p;
#endif
}
///
/// Returns the object associated with a given name in the declaration
/// space. This is the inverse operation of `DefineName'
///
public object GetDefinition (string name)
{
return defined_names [name];
}
bool in_transit = false;
///
/// This function is used to catch recursive definitions
/// in declarations.
///
public bool InTransit {
get {
return in_transit;
}
set {
in_transit = value;
}
}
public TypeContainer Parent {
get {
return parent;
}
}
///
/// Looks up the alias for the name
///
public string LookupAlias (string name)
{
if (NamespaceEntry != null)
return NamespaceEntry.LookupAlias (name);
else
return null;
}
//
// root_types contains all the types. All TopLevel types
// hence have a parent that points to `root_types', that is
// why there is a non-obvious test down here.
//
public bool IsTopLevel {
get {
if (parent != null){
if (parent.parent == null)
return true;
}
return false;
}
}
public virtual void CloseType ()
{
if ((caching_flags & Flags.CloseTypeCreated) == 0){
try {
TypeBuilder.CreateType ();
} catch {
//
// The try/catch is needed because
// nested enumerations fail to load when they
// are defined.
//
// Even if this is the right order (enumerations
// declared after types).
//
// Note that this still creates the type and
// it is possible to save it
}
caching_flags |= Flags.CloseTypeCreated;
}
}
///
/// Should be overriten by the appropriate declaration space
///
public abstract TypeBuilder DefineType ();
///
/// Define all members, but don't apply any attributes or do anything which may
/// access not-yet-defined classes. This method also creates the MemberCache.
///
public abstract bool DefineMembers (TypeContainer parent);
//
// Whether this is an `unsafe context'
//
public bool UnsafeContext {
get {
if ((ModFlags & Modifiers.UNSAFE) != 0)
return true;
if (parent != null)
return parent.UnsafeContext;
return false;
}
}
public static string MakeFQN (string nsn, string name)
{
if (nsn == "")
return name;
return String.Concat (nsn, ".", name);
}
EmitContext type_resolve_ec;
EmitContext GetTypeResolveEmitContext (TypeContainer parent, Location loc)
{
type_resolve_ec = new EmitContext (parent, this, loc, null, null, ModFlags, false);
type_resolve_ec.ResolvingTypeTree = true;
return type_resolve_ec;
}
//
// Looks up the type, as parsed into the expression `e'
//
public Type ResolveType (Expression e, bool silent, Location loc)
{
if (type_resolve_ec == null)
type_resolve_ec = GetTypeResolveEmitContext (parent, loc);
type_resolve_ec.loc = loc;
type_resolve_ec.ContainerType = TypeBuilder;
int errors = Report.Errors;
TypeExpr d = e.ResolveAsTypeTerminal (type_resolve_ec);
if (d == null || d.eclass != ExprClass.Type){
if (!silent && errors == Report.Errors){
Report.Error (246, loc, "Cannot find type `"+ e.ToString () +"'");
}
return null;
}
if (!d.CheckAccessLevel (this)) {
Report.Error_T (122, loc, d.Name);
return null;
}
return d.Type;
}
//
// Resolves the expression `e' for a type, and will recursively define
// types.
//
public TypeExpr ResolveTypeExpr (Expression e, bool silent, Location loc)
{
if (type_resolve_ec == null)
type_resolve_ec = GetTypeResolveEmitContext (parent, loc);
type_resolve_ec.loc = loc;
type_resolve_ec.ContainerType = TypeBuilder;
TypeExpr d = e.ResolveAsTypeTerminal (type_resolve_ec);
if (d == null || d.eclass != ExprClass.Type){
if (!silent){
Report.Error (246, loc, "Cannot find type `"+ e +"'");
}
return null;
}
return d;
}
public bool CheckAccessLevel (Type check_type)
{
if (check_type == TypeBuilder)
return true;
TypeAttributes check_attr = check_type.Attributes & TypeAttributes.VisibilityMask;
//
// Broken Microsoft runtime, return public for arrays, no matter what
// the accessibility is for their underlying class, and they return
// NonPublic visibility for pointers
//
if (check_type.IsArray || check_type.IsPointer)
return CheckAccessLevel (TypeManager.GetElementType (check_type));
switch (check_attr){
case TypeAttributes.Public:
return true;
case TypeAttributes.NotPublic:
// In same cases is null.
if (TypeBuilder == null)
return true;
//
// This test should probably use the declaringtype.
//
return check_type.Assembly == TypeBuilder.Assembly;
case TypeAttributes.NestedPublic:
return true;
case TypeAttributes.NestedPrivate:
string check_type_name = check_type.FullName;
string type_name = TypeBuilder.FullName;
int cio = check_type_name.LastIndexOf ('+');
string container = check_type_name.Substring (0, cio);
//
// Check if the check_type is a nested class of the current type
//
if (check_type_name.StartsWith (type_name + "+")){
return true;
}
if (type_name.StartsWith (container)){
return true;
}
return false;
case TypeAttributes.NestedFamily:
//
// Only accessible to methods in current type or any subtypes
//
return FamilyAccessible (check_type);
case TypeAttributes.NestedFamANDAssem:
return (check_type.Assembly == TypeBuilder.Assembly) &&
FamilyAccessible (check_type);
case TypeAttributes.NestedFamORAssem:
return (check_type.Assembly == TypeBuilder.Assembly) ||
FamilyAccessible (check_type);
case TypeAttributes.NestedAssembly:
return check_type.Assembly == TypeBuilder.Assembly;
}
Console.WriteLine ("HERE: " + check_attr);
return false;
}
protected bool FamilyAccessible (Type check_type)
{
Type declaring = check_type.DeclaringType;
if (TypeBuilder.IsSubclassOf (declaring))
return true;
string check_type_name = check_type.FullName;
int cio = check_type_name.LastIndexOf ('+');
string container = check_type_name.Substring (0, cio);
//
// Check if the check_type is a nested class of the current type
//
if (check_type_name.StartsWith (container + "+"))
return true;
return false;
}
// Access level of a type.
const int X = 1;
enum AccessLevel { // Each column represents `is this scope larger or equal to Blah scope'
// Public Assembly Protected
Protected = (0 << 0) | (0 << 1) | (X << 2),
Public = (X << 0) | (X << 1) | (X << 2),
Private = (0 << 0) | (0 << 1) | (0 << 2),
Internal = (0 << 0) | (X << 1) | (0 << 2),
ProtectedOrInternal = (0 << 0) | (X << 1) | (X << 2),
}
static AccessLevel GetAccessLevelFromModifiers (int flags)
{
if ((flags & Modifiers.INTERNAL) != 0) {
if ((flags & Modifiers.PROTECTED) != 0)
return AccessLevel.ProtectedOrInternal;
else
return AccessLevel.Internal;
} else if ((flags & Modifiers.PROTECTED) != 0)
return AccessLevel.Protected;
else if ((flags & Modifiers.PRIVATE) != 0)
return AccessLevel.Private;
else
return AccessLevel.Public;
}
// What is the effective access level of this?
// TODO: Cache this?
AccessLevel EffectiveAccessLevel {
get {
AccessLevel myAccess = GetAccessLevelFromModifiers (ModFlags);
if (!IsTopLevel && (Parent != null))
return myAccess & Parent.EffectiveAccessLevel;
else
return myAccess;
}
}
// Return the access level for type `t'
static AccessLevel TypeEffectiveAccessLevel (Type t)
{
if (t.IsPublic)
return AccessLevel.Public;
if (t.IsNestedPrivate)
return AccessLevel.Private;
if (t.IsNotPublic)
return AccessLevel.Internal;
// By now, it must be nested
AccessLevel parentLevel = TypeEffectiveAccessLevel (t.DeclaringType);
if (t.IsNestedPublic)
return parentLevel;
if (t.IsNestedAssembly)
return parentLevel & AccessLevel.Internal;
if (t.IsNestedFamily)
return parentLevel & AccessLevel.Protected;
if (t.IsNestedFamORAssem)
return parentLevel & AccessLevel.ProtectedOrInternal;
if (t.IsNestedFamANDAssem)
throw new NotImplementedException ("NestedFamANDAssem not implemented, cant make this kind of type from c# anyways");
// nested private is taken care of
throw new Exception ("I give up, what are you?");
}
//
// This answers `is the type P, as accessible as a member M which has the
// accessability @flags which is declared as a nested member of the type T, this declspace'
//
public bool AsAccessible (Type p, int flags)
{
//
// 1) if M is private, its accessability is the same as this declspace.
// we already know that P is accessible to T before this method, so we
// may return true.
//
if ((flags & Modifiers.PRIVATE) != 0)
return true;
while (p.IsArray || p.IsPointer || p.IsByRef)
p = TypeManager.GetElementType (p);
AccessLevel pAccess = TypeEffectiveAccessLevel (p);
AccessLevel mAccess = this.EffectiveAccessLevel &
GetAccessLevelFromModifiers (flags);
// for every place from which we can access M, we must
// be able to access P as well. So, we want
// For every bit in M and P, M_i -> P_1 == true
// or, ~ (M -> P) == 0 <-> ~ ( ~M | P) == 0
return ~ (~ mAccess | pAccess) == 0;
}
static DoubleHash dh = new DoubleHash (1000);
Type DefineTypeAndParents (DeclSpace tc)
{
DeclSpace container = tc.Parent;
if (container.TypeBuilder == null && container.Name != "")
DefineTypeAndParents (container);
return tc.DefineType ();
}
Type LookupInterfaceOrClass (string ns, string name, out bool error)
{
DeclSpace parent;
Type t;
object r;
error = false;
int p = name.LastIndexOf ('.');
if (dh.Lookup (ns, name, out r))
return (Type) r;
else {
//
// If the type is not a nested type, we do not need `LookupType's processing.
// If the @name does not have a `.' in it, this cant be a nested type.
//
if (ns != ""){
if (Namespace.IsNamespace (ns)) {
if (p != -1)
t = TypeManager.LookupType (ns + "." + name);
else
t = TypeManager.LookupTypeDirect (ns + "." + name);
} else
t = null;
} else if (p != -1)
t = TypeManager.LookupType (name);
else
t = TypeManager.LookupTypeDirect (name);
}
if (t != null) {
dh.Insert (ns, name, t);
return t;
}
//
// In case we are fed a composite name, normalize it.
//
if (p != -1){
ns = MakeFQN (ns, name.Substring (0, p));
name = name.Substring (p+1);
}
parent = RootContext.Tree.LookupByNamespace (ns, name);
if (parent == null) {
dh.Insert (ns, name, null);
return null;
}
t = DefineTypeAndParents (parent);
if (t == null){
error = true;
return null;
}
dh.Insert (ns, name, t);
return t;
}
public static void Error_AmbiguousTypeReference (Location loc, string name, Type t1, Type t2)
{
Report.Error (104, loc,
String.Format ("`{0}' is an ambiguous reference ({1} or {2}) ", name,
t1.FullName, t2.FullName));
}
///
/// GetType is used to resolve type names at the DeclSpace level.
/// Use this to lookup class/struct bases, interface bases or
/// delegate type references
///
///
///
/// Contrast this to LookupType which is used inside method bodies to
/// lookup types that have already been defined. GetType is used
/// during the tree resolution process and potentially define
/// recursively the type
///
public Type FindType (Location loc, string name)
{
Type t;
bool error;
//
// For the case the type we are looking for is nested within this one
// or is in any base class
//
DeclSpace containing_ds = this;
while (containing_ds != null){
Type container_type = containing_ds.TypeBuilder;
Type current_type = container_type;
while (current_type != null && current_type != TypeManager.object_type) {
string pre = current_type.FullName;
t = LookupInterfaceOrClass (pre, name, out error);
if (error)
return null;
if ((t != null) && containing_ds.CheckAccessLevel (t))
return t;
current_type = current_type.BaseType;
}
containing_ds = containing_ds.Parent;
}
//
// Attempt to lookup the class on our namespace and all it's implicit parents
//
for (NamespaceEntry ns = NamespaceEntry; ns != null; ns = ns.ImplicitParent) {
t = LookupInterfaceOrClass (ns.FullName, name, out error);
if (error)
return null;
if (t != null)
return t;
}
//
// Attempt to do a direct unqualified lookup
//
t = LookupInterfaceOrClass ("", name, out error);
if (error)
return null;
if (t != null)
return t;
//
// Attempt to lookup the class on any of the `using'
// namespaces
//
for (NamespaceEntry ns = NamespaceEntry; ns != null; ns = ns.Parent){
t = LookupInterfaceOrClass (ns.FullName, name, out error);
if (error)
return null;
if (t != null)
return t;
if (name.IndexOf ('.') > 0)
continue;
string alias_value = ns.LookupAlias (name);
if (alias_value != null) {
t = LookupInterfaceOrClass ("", alias_value, out error);
if (error)
return null;
if (t != null)
return t;
}
//
// Now check the using clause list
//
Type match = null;
foreach (Namespace using_ns in ns.GetUsingTable ()) {
match = LookupInterfaceOrClass (using_ns.Name, name, out error);
if (error)
return null;
if (match != null){
if (t != null){
if (CheckAccessLevel (match)) {
Error_AmbiguousTypeReference (loc, name, t, match);
return null;
}
continue;
}
t = match;
}
}
if (t != null)
return t;
}
//Report.Error (246, Location, "Can not find type `"+name+"'");
return null;
}
///
/// This function is broken and not what you're looking for. It should only
/// be used while the type is still being created since it doesn't use the cache
/// and relies on the filter doing the member name check.
///
public abstract MemberList FindMembers (MemberTypes mt, BindingFlags bf,
MemberFilter filter, object criteria);
///
/// If we have a MemberCache, return it. This property may return null if the
/// class doesn't have a member cache or while it's still being created.
///
public abstract MemberCache MemberCache {
get;
}
public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb)
{
try {
TypeBuilder.SetCustomAttribute (cb);
} catch (System.ArgumentException e) {
Report.Warning (-21, a.Location,
"The CharSet named property on StructLayout\n"+
"\tdoes not work correctly on Microsoft.NET\n"+
"\tYou might want to remove the CharSet declaration\n"+
"\tor compile using the Mono runtime instead of the\n"+
"\tMicrosoft .NET runtime\n"+
"\tThe runtime gave the error: " + e);
}
}
///
/// Goes through class hierarchy and get value of first CLSCompliantAttribute that found.
/// If no is attribute exists then return assembly CLSCompliantAttribute.
///
public bool GetClsCompliantAttributeValue ()
{
if ((caching_flags & Flags.HasCompliantAttribute_Undetected) == 0)
return (caching_flags & Flags.ClsCompliantAttributeTrue) != 0;
caching_flags &= ~Flags.HasCompliantAttribute_Undetected;
if (OptAttributes != null) {
EmitContext ec = new EmitContext (parent, this, Location,
null, null, ModFlags, false);
Attribute cls_attribute = OptAttributes.GetClsCompliantAttribute (ec);
if (cls_attribute != null) {
caching_flags |= Flags.HasClsCompliantAttribute;
if (cls_attribute.GetClsCompliantAttributeValue (this)) {
caching_flags |= Flags.ClsCompliantAttributeTrue;
return true;
}
return false;
}
}
if (parent == null) {
if (CodeGen.Assembly.IsClsCompliant) {
caching_flags |= Flags.ClsCompliantAttributeTrue;
return true;
}
return false;
}
if (parent.GetClsCompliantAttributeValue ()) {
caching_flags |= Flags.ClsCompliantAttributeTrue;
return true;
}
return false;
}
// Tests container name for CLS-Compliant name (differing only in case)
// Possible optimalization: search in same namespace only
protected override bool IsIdentifierClsCompliant (DeclSpace ds)
{
int l = Name.Length;
if (Namespace.LookupNamespace (NamespaceEntry.FullName, false) != null) {
// Seek through all imported types
foreach (string type_name in TypeManager.all_imported_types.Keys)
{
if (l != type_name.Length)
continue;
if (String.Compare (Name, type_name, true, CultureInfo.InvariantCulture) == 0 &&
AttributeTester.IsClsCompliant (TypeManager.all_imported_types [type_name] as Type)) {
Report.SymbolRelatedToPreviousError ((Type)TypeManager.all_imported_types [type_name]);
return false;
}
}
}
// Seek through generated types
foreach (string name in RootContext.Tree.Decls.Keys) {
if (l != name.Length)
continue;
if (String.Compare (Name, name, true, CultureInfo.InvariantCulture) == 0) {
if (Name == name)
continue;
DeclSpace found_ds = RootContext.Tree.Decls[name] as DeclSpace;
if (found_ds.IsClsCompliaceRequired (found_ds.Parent)) {
Report.SymbolRelatedToPreviousError (found_ds.Location, found_ds.GetSignatureForError ());
return false;
}
}
}
return true;
}
protected override string[] ValidAttributeTargets {
get {
return attribute_targets;
}
}
}
///
/// This is a readonly list of MemberInfo's.
///
public class MemberList : IList {
public readonly IList List;
int count;
///
/// Create a new MemberList from the given IList.
///
public MemberList (IList list)
{
if (list != null)
this.List = list;
else
this.List = new ArrayList ();
count = List.Count;
}
///
/// Concatenate the ILists `first' and `second' to a new MemberList.
///
public MemberList (IList first, IList second)
{
ArrayList list = new ArrayList ();
list.AddRange (first);
list.AddRange (second);
count = list.Count;
List = list;
}
public static readonly MemberList Empty = new MemberList (new ArrayList ());
///
/// Cast the MemberList into a MemberInfo[] array.
///
///
/// This is an expensive operation, only use it if it's really necessary.
///
public static explicit operator MemberInfo [] (MemberList list)
{
Timer.StartTimer (TimerType.MiscTimer);
MemberInfo [] result = new MemberInfo [list.Count];
list.CopyTo (result, 0);
Timer.StopTimer (TimerType.MiscTimer);
return result;
}
// ICollection
public int Count {
get {
return count;
}
}
public bool IsSynchronized {
get {
return List.IsSynchronized;
}
}
public object SyncRoot {
get {
return List.SyncRoot;
}
}
public void CopyTo (Array array, int index)
{
List.CopyTo (array, index);
}
// IEnumerable
public IEnumerator GetEnumerator ()
{
return List.GetEnumerator ();
}
// IList
public bool IsFixedSize {
get {
return true;
}
}
public bool IsReadOnly {
get {
return true;
}
}
object IList.this [int index] {
get {
return List [index];
}
set {
throw new NotSupportedException ();
}
}
// FIXME: try to find out whether we can avoid the cast in this indexer.
public MemberInfo this [int index] {
get {
return (MemberInfo) List [index];
}
}
public int Add (object value)
{
throw new NotSupportedException ();
}
public void Clear ()
{
throw new NotSupportedException ();
}
public bool Contains (object value)
{
return List.Contains (value);
}
public int IndexOf (object value)
{
return List.IndexOf (value);
}
public void Insert (int index, object value)
{
throw new NotSupportedException ();
}
public void Remove (object value)
{
throw new NotSupportedException ();
}
public void RemoveAt (int index)
{
throw new NotSupportedException ();
}
}
///
/// This interface is used to get all members of a class when creating the
/// member cache. It must be implemented by all DeclSpace derivatives which
/// want to support the member cache and by TypeHandle to get caching of
/// non-dynamic types.
///
public interface IMemberContainer {
///
/// The name of the IMemberContainer. This is only used for
/// debugging purposes.
///
string Name {
get;
}
///
/// The type of this IMemberContainer.
///
Type Type {
get;
}
///
/// Returns the IMemberContainer of the parent class or null if this
/// is an interface or TypeManger.object_type.
/// This is used when creating the member cache for a class to get all
/// members from the parent class.
///
IMemberContainer Parent {
get;
}
///
/// Whether this is an interface.
///
bool IsInterface {
get;
}
///
/// Returns all members of this class with the corresponding MemberTypes
/// and BindingFlags.
///
///
/// When implementing this method, make sure not to return any inherited
/// members and check the MemberTypes and BindingFlags properly.
/// Unfortunately, System.Reflection is lame and doesn't provide a way to
/// get the BindingFlags (static/non-static,public/non-public) in the
/// MemberInfo class, but the cache needs this information. That's why
/// this method is called multiple times with different BindingFlags.
///
MemberList GetMembers (MemberTypes mt, BindingFlags bf);
///
/// Return the container's member cache.
///
MemberCache MemberCache {
get;
}
}
///
/// The MemberCache is used by dynamic and non-dynamic types to speed up
/// member lookups. It has a member name based hash table; it maps each member
/// name to a list of CacheEntry objects. Each CacheEntry contains a MemberInfo
/// and the BindingFlags that were initially used to get it. The cache contains
/// all members of the current class and all inherited members. If this cache is
/// for an interface types, it also contains all inherited members.
///
/// There are two ways to get a MemberCache:
/// * if this is a dynamic type, lookup the corresponding DeclSpace and then
/// use the DeclSpace.MemberCache property.
/// * if this not a dynamic type, call TypeHandle.GetTypeHandle() to get a
/// TypeHandle instance for the type and then use TypeHandle.MemberCache.
///
public class MemberCache {
public readonly IMemberContainer Container;
protected Hashtable member_hash;
protected Hashtable method_hash;
///
/// Create a new MemberCache for the given IMemberContainer `container'.
///
public MemberCache (IMemberContainer container)
{
this.Container = container;
Timer.IncrementCounter (CounterType.MemberCache);
Timer.StartTimer (TimerType.CacheInit);
// If we have a parent class (we have a parent class unless we're
// TypeManager.object_type), we deep-copy its MemberCache here.
if (Container.IsInterface) {
MemberCache parent;
if (Container.Parent != null)
parent = Container.Parent.MemberCache;
else
parent = TypeHandle.ObjectType.MemberCache;
member_hash = SetupCacheForInterface (parent);
} else if (Container.Parent != null)
member_hash = SetupCache (Container.Parent.MemberCache);
else
member_hash = new Hashtable ();
// If this is neither a dynamic type nor an interface, create a special
// method cache with all declared and inherited methods.
Type type = container.Type;
if (!(type is TypeBuilder) && !type.IsInterface) {
method_hash = new Hashtable ();
AddMethods (type);
}
// Add all members from the current class.
AddMembers (Container);
Timer.StopTimer (TimerType.CacheInit);
}
///
/// Bootstrap this member cache by doing a deep-copy of our parent.
///
Hashtable SetupCache (MemberCache parent)
{
Hashtable hash = new Hashtable ();
IDictionaryEnumerator it = parent.member_hash.GetEnumerator ();
while (it.MoveNext ()) {
hash [it.Key] = ((ArrayList) it.Value).Clone ();
}
return hash;
}
///
/// Add the contents of `new_hash' to `hash'.
///
void AddHashtable (Hashtable hash, MemberCache cache)
{
Hashtable new_hash = cache.member_hash;
IDictionaryEnumerator it = new_hash.GetEnumerator ();
while (it.MoveNext ()) {
ArrayList list = (ArrayList) hash [it.Key];
if (list == null)
hash [it.Key] = list = new ArrayList ();
foreach (CacheEntry entry in (ArrayList) it.Value) {
if (entry.Container != cache.Container)
break;
list.Add (entry);
}
}
}
///
/// Bootstrap the member cache for an interface type.
/// Type.GetMembers() won't return any inherited members for interface types,
/// so we need to do this manually. Interfaces also inherit from System.Object.
///
Hashtable SetupCacheForInterface (MemberCache parent)
{
Hashtable hash = SetupCache (parent);
TypeExpr [] ifaces = TypeManager.GetInterfaces (Container.Type);
foreach (TypeExpr iface in ifaces) {
Type itype = iface.Type;
IMemberContainer iface_container =
TypeManager.LookupMemberContainer (itype);
MemberCache iface_cache = iface_container.MemberCache;
AddHashtable (hash, iface_cache);
}
return hash;
}
///
/// Add all members from class `container' to the cache.
///
void AddMembers (IMemberContainer container)
{
// We need to call AddMembers() with a single member type at a time
// to get the member type part of CacheEntry.EntryType right.
AddMembers (MemberTypes.Constructor, container);
AddMembers (MemberTypes.Field, container);
AddMembers (MemberTypes.Method, container);
AddMembers (MemberTypes.Property, container);
AddMembers (MemberTypes.Event, container);
// Nested types are returned by both Static and Instance searches.
AddMembers (MemberTypes.NestedType,
BindingFlags.Static | BindingFlags.Public, container);
AddMembers (MemberTypes.NestedType,
BindingFlags.Static | BindingFlags.NonPublic, container);
}
void AddMembers (MemberTypes mt, IMemberContainer container)
{
AddMembers (mt, BindingFlags.Static | BindingFlags.Public, container);
AddMembers (mt, BindingFlags.Static | BindingFlags.NonPublic, container);
AddMembers (mt, BindingFlags.Instance | BindingFlags.Public, container);
AddMembers (mt, BindingFlags.Instance | BindingFlags.NonPublic, container);
}
///
/// Add all members from class `container' with the requested MemberTypes and
/// BindingFlags to the cache. This method is called multiple times with different
/// MemberTypes and BindingFlags.
///
void AddMembers (MemberTypes mt, BindingFlags bf, IMemberContainer container)
{
MemberList members = container.GetMembers (mt, bf);
foreach (MemberInfo member in members) {
string name = member.Name;
// We use a name-based hash table of ArrayList's.
ArrayList list = (ArrayList) member_hash [name];
if (list == null) {
list = new ArrayList ();
member_hash.Add (name, list);
}
// When this method is called for the current class, the list will
// already contain all inherited members from our parent classes.
// We cannot add new members in front of the list since this'd be an
// expensive operation, that's why the list is sorted in reverse order
// (ie. members from the current class are coming last).
list.Add (new CacheEntry (container, member, mt, bf));
}
}
///
/// Add all declared and inherited methods from class `type' to the method cache.
///
void AddMethods (Type type)
{
AddMethods (BindingFlags.Static | BindingFlags.Public |
BindingFlags.FlattenHierarchy, type);
AddMethods (BindingFlags.Static | BindingFlags.NonPublic |
BindingFlags.FlattenHierarchy, type);
AddMethods (BindingFlags.Instance | BindingFlags.Public, type);
AddMethods (BindingFlags.Instance | BindingFlags.NonPublic, type);
}
void AddMethods (BindingFlags bf, Type type)
{
MemberInfo [] members = type.GetMethods (bf);
Array.Reverse (members);
foreach (MethodBase member in members) {
string name = member.Name;
// We use a name-based hash table of ArrayList's.
ArrayList list = (ArrayList) method_hash [name];
if (list == null) {
list = new ArrayList ();
method_hash.Add (name, list);
}
// Unfortunately, the elements returned by Type.GetMethods() aren't
// sorted so we need to do this check for every member.
BindingFlags new_bf = bf;
if (member.DeclaringType == type)
new_bf |= BindingFlags.DeclaredOnly;
list.Add (new CacheEntry (Container, member, MemberTypes.Method, new_bf));
}
}
///
/// Compute and return a appropriate `EntryType' magic number for the given
/// MemberTypes and BindingFlags.
///
protected static EntryType GetEntryType (MemberTypes mt, BindingFlags bf)
{
EntryType type = EntryType.None;
if ((mt & MemberTypes.Constructor) != 0)
type |= EntryType.Constructor;
if ((mt & MemberTypes.Event) != 0)
type |= EntryType.Event;
if ((mt & MemberTypes.Field) != 0)
type |= EntryType.Field;
if ((mt & MemberTypes.Method) != 0)
type |= EntryType.Method;
if ((mt & MemberTypes.Property) != 0)
type |= EntryType.Property;
// Nested types are returned by static and instance searches.
if ((mt & MemberTypes.NestedType) != 0)
type |= EntryType.NestedType | EntryType.Static | EntryType.Instance;
if ((bf & BindingFlags.Instance) != 0)
type |= EntryType.Instance;
if ((bf & BindingFlags.Static) != 0)
type |= EntryType.Static;
if ((bf & BindingFlags.Public) != 0)
type |= EntryType.Public;
if ((bf & BindingFlags.NonPublic) != 0)
type |= EntryType.NonPublic;
if ((bf & BindingFlags.DeclaredOnly) != 0)
type |= EntryType.Declared;
return type;
}
///
/// The `MemberTypes' enumeration type is a [Flags] type which means that it may
/// denote multiple member types. Returns true if the given flags value denotes a
/// single member types.
///
public static bool IsSingleMemberType (MemberTypes mt)
{
switch (mt) {
case MemberTypes.Constructor:
case MemberTypes.Event:
case MemberTypes.Field:
case MemberTypes.Method:
case MemberTypes.Property:
case MemberTypes.NestedType:
return true;
default:
return false;
}
}
///
/// We encode the MemberTypes and BindingFlags of each members in a "magic"
/// number to speed up the searching process.
///
[Flags]
protected enum EntryType {
None = 0x000,
Instance = 0x001,
Static = 0x002,
MaskStatic = Instance|Static,
Public = 0x004,
NonPublic = 0x008,
MaskProtection = Public|NonPublic,
Declared = 0x010,
Constructor = 0x020,
Event = 0x040,
Field = 0x080,
Method = 0x100,
Property = 0x200,
NestedType = 0x400,
MaskType = Constructor|Event|Field|Method|Property|NestedType
}
protected struct CacheEntry {
public readonly IMemberContainer Container;
public readonly EntryType EntryType;
public readonly MemberInfo Member;
public CacheEntry (IMemberContainer container, MemberInfo member,
MemberTypes mt, BindingFlags bf)
{
this.Container = container;
this.Member = member;
this.EntryType = GetEntryType (mt, bf);
}
}
///
/// This is called each time we're walking up one level in the class hierarchy
/// and checks whether we can abort the search since we've already found what
/// we were looking for.
///
protected bool DoneSearching (ArrayList list)
{
//
// We've found exactly one member in the current class and it's not
// a method or constructor.
//
if (list.Count == 1 && !(list [0] is MethodBase))
return true;
//
// Multiple properties: we query those just to find out the indexer
// name
//
if ((list.Count > 0) && (list [0] is PropertyInfo))
return true;
return false;
}
///
/// Looks up members with name `name'. If you provide an optional
/// filter function, it'll only be called with members matching the
/// requested member name.
///
/// This method will try to use the cache to do the lookup if possible.
///
/// Unlike other FindMembers implementations, this method will always
/// check all inherited members - even when called on an interface type.
///
/// If you know that you're only looking for methods, you should use
/// MemberTypes.Method alone since this speeds up the lookup a bit.
/// When doing a method-only search, it'll try to use a special method
/// cache (unless it's a dynamic type or an interface) and the returned
/// MemberInfo's will have the correct ReflectedType for inherited methods.
/// The lookup process will automatically restart itself in method-only
/// search mode if it discovers that it's about to return methods.
///
ArrayList global = new ArrayList ();
bool using_global = false;
static MemberInfo [] emptyMemberInfo = new MemberInfo [0];
public MemberInfo [] FindMembers (MemberTypes mt, BindingFlags bf, string name,
MemberFilter filter, object criteria)
{
if (using_global)
throw new Exception ();
bool declared_only = (bf & BindingFlags.DeclaredOnly) != 0;
bool method_search = mt == MemberTypes.Method;
// If we have a method cache and we aren't already doing a method-only search,
// then we restart a method search if the first match is a method.
bool do_method_search = !method_search && (method_hash != null);
ArrayList applicable;
// If this is a method-only search, we try to use the method cache if
// possible; a lookup in the method cache will return a MemberInfo with
// the correct ReflectedType for inherited methods.
if (method_search && (method_hash != null))
applicable = (ArrayList) method_hash [name];
else
applicable = (ArrayList) member_hash [name];
if (applicable == null)
return emptyMemberInfo;
//
// 32 slots gives 53 rss/54 size
// 2/4 slots gives 55 rss
//
// Strange: from 25,000 calls, only 1,800
// are above 2. Why does this impact it?
//
global.Clear ();
using_global = true;
Timer.StartTimer (TimerType.CachedLookup);
EntryType type = GetEntryType (mt, bf);
IMemberContainer current = Container;
// `applicable' is a list of all members with the given member name `name'
// in the current class and all its parent classes. The list is sorted in
// reverse order due to the way how the cache is initialy created (to speed
// things up, we're doing a deep-copy of our parent).
for (int i = applicable.Count-1; i >= 0; i--) {
CacheEntry entry = (CacheEntry) applicable [i];
// This happens each time we're walking one level up in the class
// hierarchy. If we're doing a DeclaredOnly search, we must abort
// the first time this happens (this may already happen in the first
// iteration of this loop if there are no members with the name we're
// looking for in the current class).
if (entry.Container != current) {
if (declared_only || DoneSearching (global))
break;
current = entry.Container;
}
// Is the member of the correct type ?
if ((entry.EntryType & type & EntryType.MaskType) == 0)
continue;
// Is the member static/non-static ?
if ((entry.EntryType & type & EntryType.MaskStatic) == 0)
continue;
// Apply the filter to it.
if (filter (entry.Member, criteria)) {
if ((entry.EntryType & EntryType.MaskType) != EntryType.Method)
do_method_search = false;
global.Add (entry.Member);
}
}
Timer.StopTimer (TimerType.CachedLookup);
// If we have a method cache and we aren't already doing a method-only
// search, we restart in method-only search mode if the first match is
// a method. This ensures that we return a MemberInfo with the correct
// ReflectedType for inherited methods.
if (do_method_search && (global.Count > 0)){
using_global = false;
return FindMembers (MemberTypes.Method, bf, name, filter, criteria);
}
using_global = false;
MemberInfo [] copy = new MemberInfo [global.Count];
global.CopyTo (copy);
return copy;
}
// find the nested type @name in @this.
public Type FindNestedType (string name)
{
ArrayList applicable = (ArrayList) member_hash [name];
if (applicable == null)
return null;
for (int i = applicable.Count-1; i >= 0; i--) {
CacheEntry entry = (CacheEntry) applicable [i];
if ((entry.EntryType & EntryType.NestedType & EntryType.MaskType) != 0)
return (Type) entry.Member;
}
return null;
}
//
// This finds the method or property for us to override. invocationType is the type where
// the override is going to be declared, name is the name of the method/property, and
// paramTypes is the parameters, if any to the method or property
//
// Because the MemberCache holds members from this class and all the base classes,
// we can avoid tons of reflection stuff.
//
public MemberInfo FindMemberToOverride (Type invocationType, string name, Type [] paramTypes, bool is_property)
{
ArrayList applicable;
if (method_hash != null && !is_property)
applicable = (ArrayList) method_hash [name];
else
applicable = (ArrayList) member_hash [name];
if (applicable == null)
return null;
//
// Walk the chain of methods, starting from the top.
//
for (int i = applicable.Count - 1; i >= 0; i--) {
CacheEntry entry = (CacheEntry) applicable [i];
if ((entry.EntryType & (is_property ? (EntryType.Property | EntryType.Field) : EntryType.Method)) == 0)
continue;
PropertyInfo pi = null;
MethodInfo mi = null;
FieldInfo fi = null;
Type [] cmpAttrs = null;
if (is_property) {
if ((entry.EntryType & EntryType.Field) != 0) {
fi = (FieldInfo)entry.Member;
// TODO: For this case we ignore member type
//fb = TypeManager.GetField (fi);
//cmpAttrs = new Type[] { fb.MemberType };
} else {
pi = (PropertyInfo) entry.Member;
cmpAttrs = TypeManager.GetArgumentTypes (pi);
}
} else {
mi = (MethodInfo) entry.Member;
cmpAttrs = TypeManager.GetArgumentTypes (mi);
}
if (fi != null) {
// TODO: Almost duplicate !
// Check visibility
switch (fi.Attributes & FieldAttributes.FieldAccessMask) {
case FieldAttributes.Private:
//
// A private method is Ok if we are a nested subtype.
// The spec actually is not very clear about this, see bug 52458.
//
if (invocationType != entry.Container.Type &
TypeManager.IsNestedChildOf (invocationType, entry.Container.Type))
continue;
break;
case FieldAttributes.FamANDAssem:
case FieldAttributes.Assembly:
//
// Check for assembly methods
//
if (mi.DeclaringType.Assembly != CodeGen.Assembly.Builder)
continue;
break;
}
return entry.Member;
}
//
// Check the arguments
//
if (cmpAttrs.Length != paramTypes.Length)
continue;
for (int j = cmpAttrs.Length - 1; j >= 0; j --)
if (paramTypes [j] != cmpAttrs [j])
goto next;
//
// get one of the methods because this has the visibility info.
//
if (is_property) {
mi = pi.GetGetMethod (true);
if (mi == null)
mi = pi.GetSetMethod (true);
}
//
// Check visibility
//
switch (mi.Attributes & MethodAttributes.MemberAccessMask) {
case MethodAttributes.Private:
//
// A private method is Ok if we are a nested subtype.
// The spec actually is not very clear about this, see bug 52458.
//
if (invocationType == entry.Container.Type ||
TypeManager.IsNestedChildOf (invocationType, entry.Container.Type))
return entry.Member;
break;
case MethodAttributes.FamANDAssem:
case MethodAttributes.Assembly:
//
// Check for assembly methods
//
if (mi.DeclaringType.Assembly == CodeGen.Assembly.Builder)
return entry.Member;
break;
default:
//
// A protected method is ok, because we are overriding.
// public is always ok.
//
return entry.Member;
}
next:
;
}
return null;
}
}
}